Method of hydrating cellulose fibers in concentrated stock



Ange 31 39260 L5$W J. A. DE QEW METHOD OF HYDRATING CELLULOSE FIBERS IN GONCENTRATED STOCK Filed Feb. 9, 1925 OVERF LOW To CHEST 0/? MACH/NE H540 BOX Patented Aug. 31, 1926,

UNITED STATES PATENT: OFFICE.

Jonson ALBERT nno'nw, on mofmr vnnnomnnw YORK.

METHOD OF HYIZRATING GELL'IJ'LOfSE- FIBERS IN CONCENTRATEI; STOCK.

Application filed February '9, 1925. Serial No. 7,899.

In themanufacture of paper there isa .certain class of machinery used for beating pal methodof operating such machines is to allow the liquid pulp to flow into t emachine at a concentration of about three parts bone dry fiber to 97 of water, and it is seized by the revolvingknives and forced out by centrifugal force into 'astockchest.

Under these conditions the space between ternal pressure of over 5 lbs. per square inch by means of the feed'head and restricted discharge and at the same time having more than 4 parts of actual fibers to a 100, of fluid stock. Thus I can. obtainisurfacefliydration on the fibers and avoid cutting the fibers when the knives are in contact because the increased number of fibers receiving the blow enables them to resist the pressure without ibeing broken in two.

By this means of operation the fibers will remain longer within the sphere of the rub- "bing action because they will only be discharged from the machine as the stock isrequired and crating at high efliciency, whereas at the present time a large proportion of the power used is the friction between the. knives which come-into-contact with other knives of the shell with very little stock between them.

Although the best results are obtained by working on a stock as a concentration of over 4% total solids, nevertheless I can imthe machine will always'be op,'

the knives and the shell is never completely prove the results 'of any Jordan to a great a cutting action will take place between the by so restricting the flowof sto k from the revolving knives as they are brought in contact, whicli breaks and shortens the fiber.

l[ have been able to prevent this cutting action and at the same time increase the hydrating action and do more work with the same power by the following methods In the first place ll thicken the stock so that the percentage of bone dry fiber is over 4% of the total-fluid mass. This partialdehydration may be carried out by allowing the fluid pulp to pass through a revolving wire screen which ll calla thickener, such as shown in the figure, which extracts a part fibers come into rubbing contact with each other. Most of the beaters in 'c'o'mnron use are so con- 7 structed that the stock discharged from them til-l is too fluid to give a good jordaning action. I then allowlthis stock'to flow into the machine through a pi e at a height of ten feet or more above the nacliine and in order to maintain thevpressure from this head ll prevent the free discharge of pulp from the outlet of the machine. restricting the opening of'the discharge and thus producing a back pressure. I

Under these conditions there is an internal pressure of stock Within the machine which forces it into all the vacant spaces between the knives and-shell by maintaining an in full and the stock beingthin and very fluid, extent without changing the stock conditions Jordan that it is backed up all throughthe Jordan, filling all vacant spaces and also up the feed pipe to a height of 10 feet or over,

Thehead of the stock at the feeding. end, is the means used for forcing the however, stock through the machine at a density of over 4%. I

' The average Jordan is installed in such a manner that the stock must be thinned to under 4% in order to get the required-catoo i parts water and at the same time maintaining a pressure of'stock at the inlet to the machine of over 5 pounds, per square inch.

, 2. A method of hydrating cellulose fibers by means of a Jordan engine, which consists in first removing a portion of water from contains more than 4% the stock, until it bone dry fiber, and then forcing this through the Jordan at a pressure greater than 51 pounds per square inch at theJordan inlet.

3. A method. of hydrating cellulose fibers within a continuance beating machine of the Jordan type, which consists in pumping the pulp stock to a height above the beating machine, then passing it through a thickening device from which it is discharged at a concentration of over 4% total solids into a pipe carrying it to the beating machine, the pipe being filled with stock to a sufficient head to produce a pressure Within the machine of over 5 lbs. per square inch.

4 A methodof hydrating pulp stock in 10 a Jordan engine which consists in forcing it through the machine at a concentration of over 4% total solids and at a pressure of over 5 lbs. per square inch at'the inlet.

In testimony whereof I afl'ix my signa- 15 ture.

JUDSON ALBERT DE cEW. 

